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why12
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Homework Statement
An uncharged hollow conducting spherical shell with inner and outer radii a,b respectively
is placed into otherwise uniform electric field E. Calculate the induced charge density at a and b and electric field everywhere
Solution for E ,r>b
[tex]E = E_0 (\widehat{E_0}+\frac{3\widehat{r}Cos(\theta)-\widehat{E_0}}{r^3}b^3)[/tex]
Homework Equations
Poisson Equation
maxwells equation
The Attempt at a Solution
Obviously E = 0 for r<b
The problem seems very similar to shell at radius R=b
in which case using the
[tex]V = \Sigma (A_l r^l + \frac{B_l}{r^{l+1}})P_l (Cos(\theta))[/tex]
with boundary condition that V=0 in conductor gives the
[tex]\sigma = \frac{3}{4\pi}E_0 Cos(\theta)[/tex] in outer surface (right answer)
but wrong answer for the potential
[tex]V = -E_0 Cos(\theta) (r-\frac{b^3}{r^2})[/tex]
for the potential which is not the same as book when taking negative
divergence